DC Boiler Exam Prep 2023/2024 With Complete Solutions

DC Boiler Exam Prep 2023/2024 With Complete Solutions Area of a rectangle - Answer Length x Width Area of a Circle - Answer .7854 x Diameter² Volume of a Box - Answer Length x Width x Height Volume of a Cylinder - Answer .7854 x Diameter² x Length Circumference of a Circle - Answer π x Diameter Unit of Force - Answer Pound (lb) Formula for Force - Answer Pressure ÷ Area Unit of Work - Answer in-lb or ft-lb Formula for Work - Answer Force x Distance Unit of Power - Answer ft-lb/min Formula for Power - Answer = Work ÷ Time or (Force x Distance) ÷ Time Formula for Mechanical Horsepower - Answer = Power ÷ 33,000 ft-lb/min Fahrenheit to Celsius - Answer °C = (°F - 32) ÷ 1.8 Celsius to Fahrenheit - Answer °F = (1.8 x °C) - 32 Fahrenheit to Rankine - Answer °R = °F + 460 Celsius to Kelvin - Answer K = °C +273.15 Charles' First Law - Answer Volume1 / Pressure1 = Volume2 / Pressure2 Charles' Second Law - Answer Pressure1 / Temperature1 = Pressure2 / Temperature2 Boyle's Law - Answer Pressure1 x Volume1 = Pressure2 x Volume2 General Gas Law - Answer (Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2 Formula for Levers - Answer Resistance x DistanceR = Effort x DistanceE Formula for Inclined Planes - Answer Force x Length = Resistance x Height Formula for Wheel & Axel - Answer Force x DistanceF = Resistance x DistanceR Torque - Answer Force x Radius Safe Working Pressure of a Riveted Boiler (SWP) - Answer (Area of Staybolt x Stress Constant of Staybolt) ÷ Area Covered by Staybolt or = (a x C) ÷ A Area Covered by Staybolt - Answer = Pitch x Pitch Longitudinal Stress - Answer (P x D x L) / 2t P = Pressure D = Diameter L = Length t = thickness of steel Boiler Heating Surface (tubes) = - Answer = C x L x # C = Circumference of tubes L = Length of tubes # = Number of tubes HS = π x Diameter x Length x Number of Tubes Watts per Boiler Horsepower - Answer 746 Watts Horsepower formula - Answer = ft-lb/min ÷ 33000 ft-lb/min ft-lb formula for a pump - Answer = gpm x 8.33 x head (ft) Factor of Evaporation (FE) = - Answer = [Hs - (tfw-32)] ÷ 970.3 Hs = Enthalpy of steam tfw = temperature of feed water Latent Heat of Vaporization for Water - Answer 970.3 Btu/lb Latent Heat of Fusion